Hypothalamic lesions and sexual behavior in the domestic chick.

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Abstract
Induced 110 Rhode Island Red * White Rock chicks primed with androgen to show copulatory behavior to a prone hand. Ss which showed strong copulatory patterns were then given bilateral electrolytic lesions in either the hypothalamus or preoptic area. Ss which had bilateral symmetrical lesions in the dorsal anterior hypothalamus showed a loss of copulatory behavior which did not recover over postoperative tests. Symmetrical lesions in the lateral preoptic area, paleostriatum, or ventral anterior hypothalamus, as well as asymmetrical lesions in any region, impaired copulatory responses but they had recovered by the end of the postoperative test period. Sham lesions gave no disruption of copulatory responding. None of the lesions impaired aggressive behavior. Ss with deficits in copulatory behavior gained weight during the postoperative period and were able to discriminate and react emotionally both before and after surgery. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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